XML 140 R124.htm IDEA: XBRL DOCUMENT v3.8.0.1
Bonds Payable - Additional Information (Detail)
$ / shares in Units, $ / shares in Units, $ in Thousands, $ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Jul. 31, 2015
TWD ($)
$ / shares
Jul. 31, 2014
TWD ($)
Sep. 30, 2013
USD ($)
$ / shares
Sep. 30, 2017
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Dec. 31, 2016
$ / shares
Jul. 31, 2015
USD ($)
$ / shares
Jul. 31, 2014
USD ($)
Sep. 30, 2013
$ / shares
Unsecured overseas convertible bonds [Member]                      
Disclosure of detailed information about borrowings [line items]                      
Bonds face amount       $ 400,000   $ 400,000 $ 400,000        
Bonds maturity period       5 years              
Bonds denomination amount       $ 200              
Unsecured overseas bonds conversion price | $ / shares       $ 33.085       $ 28.99      
Unsecured overseas bonds fixed exchange rate | $ / shares                     $ 29.956
Unsecured overseas convertible bonds [Member] | Bottom of range [member]                      
Disclosure of detailed information about borrowings [line items]                      
Unsecured overseas bonds conversion price | (per share)         $ 27.95 $ 0.94          
Unsecured overseas convertible bonds [Member] | Top of range [member]                      
Disclosure of detailed information about borrowings [line items]                      
Unsecured overseas bonds conversion price | (per share)         28.96 $ 0.98          
US$400,000 thousand [member]                      
Disclosure of detailed information about borrowings [line items]                      
Unsecured overseas bonds fixed exchange rate | $ / shares         $ 29.956            
Common shares trading period         20 days 20 days 20 days        
Effective interest rate of debt host contract     3.16%                
Aggregate fair value of bonds options     $ 1,667,950                
Early redemption of outstanding bonds $ 400                    
US$400,000 thousand [member] | Bottom of range [member]                      
Disclosure of detailed information about borrowings [line items]                      
Conversion price percentage       130.00%              
Aggregate principal amount of bonds redeemed       90.00%              
US$200,000 thousand [member]                      
Disclosure of detailed information about borrowings [line items]                      
Bonds face amount                 $ 200,000    
Bonds maturity period   2 years 9 months                  
Bonds denomination amount                 $ 200    
Unsecured overseas bonds conversion price | (per share)   $ 54.55       $ 1.61 $ 47.76 $ 49.52      
Unsecured overseas bonds fixed exchange rate | $ / shares                 $ 30.928    
Common shares trading period           20 days 20 days        
Effective interest rate of debt host contract   1.58%                  
Aggregate fair value of bonds options   $ 214,022                  
US$200,000 thousand [member] | Bottom of range [member]                      
Disclosure of detailed information about borrowings [line items]                      
Conversion price percentage   130.00%                  
Aggregate principal amount of bonds redeemed   90.00%                  
US$200,000 thousand [member] | Top of range [member]                      
Disclosure of detailed information about borrowings [line items]                      
Common shares trading period           30 days 30 days        
Secured Overseas Bonds One [member]                      
Disclosure of detailed information about borrowings [line items]                      
Bonds face amount                   $ 300,000  
Bonds maturity period     3 years                
Percentage of ownership interest in subsidiary     100.00%                
Annual interest rates of bonds     2.125%         2.125%   2.125%